Test your self. - New quetsion 5.

[melkior]

Wow.

Ok....

Epic fail.

it is not a english problem, he does not understand basic math.

A colon (:) in math is universal. It stands for a ratio, period. If you are creating a problem in which the the objects are know you use a fraction (as in 1/2). If you are using creating a problem in which two or more objects exist you use a colon for example, 1 of the 2 fruits was a orange. That would be 1:2. You do not know, or even care about the other fruit, only that it exist and is not a orange. The objects are know, she made 1/3 of all free throws.

What part of my previous post did you fail to understand? A colon is not as universal as you think. The principles of mathematics are universal, symbols involved aren't. Most Slavic-speaking languages use a colon to represent division. It's a part of their writing.

In some non-English-speaking cultures, "a divided by b" is written a : b. However, in English usage the colon is restricted to expressing the related concept of ratios (then "a is to b").

source: http://en.wikipedia.org/wiki/Division_(mathematics)

The colon is also used in mathematics, cartography, model building and other fields to denote a ratio or a scale, as in 3:1 (pronounced "three to one"). Unicode provides a distinct ratio character, Unicode U+2236 (∶) for mathematical usage.
In many non-Anglophone countries the colon is used as a division sign: "a divided by b" is written as a : b.

source: http://simple.wikipedia.org/wiki/Colon_(punctuation)

I don't need a Wikipedia article to tell me that, though. I live in a country where a colon is used to express division. Elementary school, high-school, university level math, doesn't matter. We are taught about other symbols that represent division, but we aren't required to use them unless we're writing a thesis in English.

[DarkWater]

I don't need a Wikipedia article to tell me that, though. I live in a country where a colon is used to express division. Elementary school, high-school, university level math, doesn't matter. We are taught about other symbols that represent division, but we aren't required to use them unless we're writing a thesis in English.

You can use a : to say divsion, ONLY IF THE UNITS ARE KNOWN. WHAT PART OF THAT DONT YOU UNDERSTAND.

You can not assume the horse is a sphere.

In most math classes, you can because the problems will define the : and a set of a unit. IT would define an object.

You can not simply state, 8+(8:4)+(8:2)-8

reduce, (8:4)+(8:2)

Now, if the first ratio was the ratio of ice masses to rock masses orbiting Jupiter, (for every 8 ice bodies, there are 4 rock masses). And the second was the the number of girls to boys in swim class (for every 8 girls there 2 boys). And you where finding the ratio to moves on a chest board, they have nothing to do with each other, you see that. That the first ratio might not have anything to do with the second, and that answer my not have anything to do with th units.

We have define the units. And oh my god you can not solve the problem. Because in-solar masses have nothing to do with children.

Now you can say that the first is ice masses to rock masses on jupiter, and the second is the number of ice masses to rock masses saturn, and ask what is the average of the massed between the two, which is proportions. But 6 is still not our answer.

Only if you assume that the first 8:4 is a whole expressed unit, a fraction. And the second 8:2 is a whole and expressed unit a fraction and both units are the same type of unit can you solve.

You have to assume soo much to make the problem work. You have to assume the horse is a sphere.

This is what you are taught in high school, but falls apart when you start chemistry, physics, are theoretical math.

It is not that the : can be division, it is the fact that he did not express in the question that they where.

You understand that, you are assuming they are the same thing. You can not do that.

oh and quick question how do you define a ratio then?

[melkior]

I'm sorry, I see you have no idea what I'm talking about and aren't willing to read any of the links I've provided, so no point in discussing this.

The mechanics of division and its relation to ratios is something completely besides the point here. The problem is the symbol - colon.

Go open Wikipedia entry for division and use the left side menu to see the articles in other languages. You'll notice that German, Norwegian, Finnish and a whole bucketload of other languages use colon to represent both division and ratios.

I've attached an image from German entry on division just for the heck of it.

a = c : b

a ÷ b et a : b désignent une opération (non effectuée), et le vocabulaire approprié est dividende pour a et diviseur pour b ;
et a / b désignent l'écriture fractionnaire du résultat de cette opération, et le vocabulaire approprié est numérateur pour a et dénominateur pour b.

Hvis
a × b = c, der b er et annet tall enn null,
gjelder a = c : b (leses som "c dividert med b").
For eksempel er 6 : 3 = 2 siden 2 × 3 = 6.

Existem algumas formas de se representar uma divisão:
Como uma fração: , desde que o denominador seja diferente de 0.
Com uma barra:
Com o sinal de divisão:
Usando dois pontos:
Usando o sinal de inverso:

Med snedstreck
Med tecknet ÷
Med ett vågrätt (horisontellt) bråkstreck
Med kolon
Med hjälp av negativa exponenter

[snoopy]

Damn.


The rules for calculations in mathematical is:

First "Division"( : ) ,then ( x ),then ( + ),then ( - ).

________________
Do you understand?

[DarkWater]

You'll notice that German, Norwegian, Finnish and a whole bucketload of other languages use colon to represent both division and ratios.

And what I am saying and you are not understanding, is and I will make this really simple.

YOU NEED TO DEFINE THE UNITS SO THE YOU KNOW IF IT IS A DIVISION AND RATIO PROBLEM.

Do you understand that. You have to define the units. You have to. You can not just assume they are. Because you must, MUST, give some hint to the person doing the problem that you are talking about division or ratio. You have to give some hint REGRADLESS of country.

You just can not state that all : are division unless you define the units.

Hell you can not even write 1+2 without defining what the units are. one of what, 2 of what. 1 black stone, 2 white stones=how many stones do you have. What are you solving for. You can not do it.


Mathematics is a closed system. Which means that you must, MUST, define all the objects in the system, and close it.

For example, you can not just have the speed of light mean anything. It has to be defined by a value.

The original equation fails to define the objects and there for you can not start the math, until the objects are define.

This is what I pointed out in the first 5.1 verse 1.

You had two defintion for the same object. There for the system was defined at 2 over lapping system and to close the system you would have to have one real number and one imaginary unit.

You can there for solve and imply that either number is correct.

But only after you closed the mathematical system.

He does not close the system. He does not close the system because he does not define the units. He does not define the units, there for the system is open, and mathematical rules break down.

We have rules when dealing with fractions and ratios. These rules only work when the problem states either fractions or ratios. Once you define the whole of the object a ratio or a part of the whole a fraction can you solve.


You can not assume.

<edit>in english systems, a : can represent either a division or ratio, just like where you are. But you must define the unit so that why a proper rules of math can be applied. You can not assume. </edit>

[DarkWater]

Damn.


The rules for calculations in mathematical is:

First "Division"( : ) ,then ( x ),then ( + ),then ( - ).

________________
Do you understand?

No the rules for math is define the system, close the system the use the rules to calculated the result.

Do you understand.

You did not create a mathematical problem. So you can not use the rules for calculations to solve it.

I give up.

[Jaxad0127]

Keep flaming each other and I will lock this.

[melkior]

Keep flaming each other and I will lock this.

That wasn't flaming. That was just a failed attempt of discussing.

[mokII]

I dont understand wich are the qutsion say again plz.

[snoopy]

I dont understand wich are the qutsion say again plz.

Ok the quetsion are those



1)What is Yuri Gagarin?

2)Which is the capital city of Argentina?

3)When were jeans invented?
a)1872
b)1887
c)1978
d)1789

4)When was the camera invented?
a)1810
b)1820
c)1826
d)1832

5)Which is the capital city of Germania?

[malsor]

the quetsion

5)Which is the capital city of Germania?
5)Berlin


is it true?

[bcs86]

I don't really understand what this thread is now discussing, it has become dense.

Are these more questions? Could they be updated in the original post? Start a new quiz with fresh slate maybe?

1)What is Yuri Gagarin?

2)Which is the capital city of Argentina?
Dunno.

3)When were jeans invented?
a)1872
b)1887
c)1978
d)1789
I think they were invented by Levi for coal miners.
Wikipedia: Blue Jeans

4)When was the camera invented?
a)1810
b)1820
c)1826
d)1832
Dunno. I should look it up.

5)Which is the capital city of Germania?
Is it Brussels? "Germania" sounds like we are talking about historic Northern Europeans including Vikings.

You may laugh at me but please be polite. I fall behind my peers in knowledge.

[DarkWater]

3)When were jeans invented?
a)1872
b)1887
c)1978
d)1789

4)When was the camera invented?
a)1810
b)1820
c)1826
d)1832

Snoopy, you are not good at this.

Jeans, where invent before the Renaissance.

Copied from wiki

History

The word "jeans" comes from the French phrase bleu de Gênes, literally the blue of Genoa. Jeans fabric, or denim, originated independently in two places: the French town of Nîmes, to which 'denim' owes its name; and in India, where trousers made of denim material were worn by the sailors of Dhunga, which came to be known as dungarees.[2]

At the same time, denim trousers were made in Chieri, a town near Turin (Italy), during the Renaissance, and were popularised in the 19th century. These trousers were sold through the harbour of Genoa, which was the capital of the independent Republic of Genoa which was long an important naval and trading power. Early examples of trousers were made for the Genoese Navy, which required all-purpose pants for its sailors. They required pants that could be wet or dry, the legs of which could be worn while swabbing the deck. These were laundered by dragging them in nets behind the ship, and the sea water and sun would gradually bleach them to white. They were worn by Genoan sailors and stevedores in France.

But if you mean levi jeans, then it is

A German-Jewish dry goods merchant Levi Strauss was selling blue jeans under the "Levi's" name to the mining communities of California in the 1850s.

So again epic fail.

The second fail.

the camera.


History of the camera.

The first photograph was taken in 1814 by Nicéphore Niépce using a sliding wooden box camera made by Charles and Vincent Chevalier in Paris; the photograph though was not permanent and it faded. Niépce built on a discovery by Johann Heinrich Schultz (1724): a silver and chalk mixture darkens under exposure to light. While this was the introduction of photography, the history of the camera can be traced back much further. Photographic cameras were a development of the camera obscura, a device dating back to the Book of Optics (1021) of the Iraqi Arab scientist Ibn al-Haytham (Alhacen),[1] which uses a pinhole or lens to project an image of the scene outside upside-down onto a viewing surface.

Scientist-monk Roger Bacon also studied the matter. Bacon's notes and drawings, published as Perspectiva in 1267, are partly clouded with theological material describing how the Devil can insinuate himself through the pinhole by magic,[2] and it is not clear whether or not he produced such a device. On 24 January 1544 mathematician and instrument maker Reiners Gemma Frisius of Leuven University used one to watch a solar eclipse, publishing a diagram of his method in De Radio Astronimica et Geometrico in the following year.[3] In 1558 Giovanni Batista della Porta was the first to recommend the method as an aid to drawing.[4]

Before the invention of photographic processes there was no way to preserve the images produced by these cameras apart from manually tracing them. The earliest cameras were room-sized, with space for one or more people inside; these gradually evolved into more and more compact models such as that by Niépce's time portable handheld cameras suitable for photography were readily available. The first camera that was small and portable enough to be practical for photography was built by Johann Zahn in 1685, though it would be almost 150 years before such an application was possible.

second epic fail.

[DarkWater]

3)When were jeans invented?
a)1872
b)1887
c)1978
d)1789
I think they were invented by Levi for coal miners.
Wikipedia: Blue Jeans

You know that 1887 does not appear anywhere on that page.

In 1872, a patent was issue to improvement in fastening seamsof jeans.

[Ventole]

5.1+1x2+2 is not a valid expression.

Firstly, yes, it is. There is no need to enclose the 1*2 in parantheses because multiplication takes higher precedence than addition. It is true 5.1 + (1*2) + 2 would be clearer but the parantheses would not be needed.
Secondly, it was a equation he included in his first post, not an expression

5.1+1 x 2+2=?

Notice the '='?